It is important to know the devices of our enemy, the Devil. Otherwise he is likely to take advantage of us.

We should know that he is a liar, and has been from the beginning. In fact, he is the father of lies (John 8:44). He lied to Eve by misrepresenting God, and he has been doing it ever since.

He is a deceiver (Rev. 20:10).
He mixes a little truth with error. He imitates or counterfeits
everything that is of God. He poses as an angel of light and sends out
his messengers as ministers of righteousness (2 Cor. 11:14,15). He deceives by using great Signs and lying wonders (2 Th. 2:9). He corrupts the minds of people (2 Cor. 11:3).

Satan is a murderous destroyer (John 8:44; 10:10).
His goal and the goal of all his demons is to destroy. There is no
exception to that statement. As a raging lion, he goes about seeking
whom he may devour (1 Pet. 5:8). He persecutes God's people (Rev. 2:10) and destroys his own slaves through drugs, demonism, alcohol, immorality and related vices.

He is the accuser of the brethren (Rev. 12:10).
The word "devil" (Gr. diabolos) means accuser or slanderer, and as his
name is, so is he. All those who slander the brethren are doing the
devil's work.

He sows discouragement. Paul warned the
Corinthians that if they did not forgive the repentant backslider,
Satan might gain an advantage by plunging the brother into extreme
discouragement (2 Cor. 2:7-11).

Just as Satan, speaking through Peter, sought to dissuade Jesus from going to the Cross (Mark 8:31-33), so he encourages Christians to spare themselves from the shame and suffering of cross bearing.

A favorite ploy of the Wicked One is to divide
and conquer. He seeks to sow strife and discord among the saints,
knowing that "a house divided against itself cannot stand." Sad to say,
he has been all too successful in this strategy.

He blinds the minds of unbelievers lest the light
of the Gospel of the glory of Christ should shine unto them and they
should be saved (2 Cor. 4:4).
He blinds them by amusements, false religion, procrastination and
pride. He occupies them with feelings rather than facts, and with
themselves rather than Christ.

Finally, Satan attacks right after great
spiritual victories or mountaintop experiences, when the danger of
pride is greatest. He looks for a weak spot in our armor, and shoots
straight for it.

The best defense against the Devil is to live
in unclouded fellowship with the Lord, covered by the protective gear
of a holy character.